Comment 2 for bug 1351441

Here are the errors we see without this fix. Delete snapshot didn't wait for snapshot to be deleted successfully. Delete volume failed because there was still dependent snapshot.

04:32:55 Captured traceback-2:
04:32:55 ~~~~~~~~~~~~~~~~~~~~~
04:32:55 Traceback (most recent call last):
04:32:55 File "tempest/scenario/manager.py", line 250, in delete_timeout
04:32:55 not_found_exception=not_found_exception)
04:32:55 File "tempest/scenario/manager.py", line 298, in _status_timeout
04:32:55 CONF.compute.build_interval):
04:32:55 File "tempest/test.py", line 627, in call_until_true
04:32:55 time.sleep(sleep_for)
04:32:55 File "/usr/local/lib/python2.7/dist-packages/fixtures/_fixtures/timeout.py", line 52, in signal_handler
04:32:55 raise TimeoutException()
04:32:55 TimeoutException
04:32:55
04:32:55
04:32:55 Captured traceback-3:
04:32:55 ~~~~~~~~~~~~~~~~~~~~~
04:32:55 Traceback (most recent call last):
04:32:55 File "tempest/scenario/manager.py", line 191, in _wait_for_cleanups
04:32:55 self.delete_timeout(**wait)
04:32:55 File "tempest/scenario/manager.py", line 250, in delete_timeout
04:32:55 not_found_exception=not_found_exception)
04:32:55 File "tempest/scenario/manager.py", line 301, in _status_timeout
04:32:55 raise exceptions.TimeoutException(message)
04:32:55 TimeoutException: Request timed out
04:32:55 Details: Timed out waiting for thing e37de26e-f415-4e00-bdb4-d1e06b576dad to become NotFound
04:32:55
04:32:55
04:32:55 Captured traceback-1:
04:32:55 ~~~~~~~~~~~~~~~~~~~~~
04:32:55 Traceback (most recent call last):
04:32:55 File "/opt/stack/new/python-cinderclient/cinderclient/v1/volumes.py", line 228, in delete
04:32:55 self._delete("/volumes/%s" % base.getid(volume))
04:32:55 File "/opt/stack/new/python-cinderclient/cinderclient/base.py", line 162, in _delete
04:32:55 resp, body = self.api.client.delete(url)
04:32:55 File "/opt/stack/new/python-cinderclient/cinderclient/client.py", line 333, in delete
04:32:55 return self._cs_request(url, 'DELETE', **kwargs)
04:32:55 File "/opt/stack/new/python-cinderclient/cinderclient/client.py", line 290, in _cs_request
04:32:55 **kwargs)
04:32:55 File "/opt/stack/new/python-cinderclient/cinderclient/client.py", line 273, in request
04:32:55 raise exceptions.from_response(resp, body)
04:32:55 BadRequest: Invalid volume: Volume still has 1 dependent snapshots (HTTP 400) (Request-ID: req-9e47bce4-daf4-4ecd-84c0-3e90d6a75675)
04:32:55